Passat Wagon L4-2.0L (ABA) (1995)
/Page-112001.png)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor and Oxygen Sensor Control, Checking
HEATED OXYGEN SENSOR AND OXYGEN SENSOR CONTROL, CHECKING
Special tools, testers and auxiliary items
-
VAG 1551 Scan Tool (ST) or vehicle system tester VAG 1552 with VAG 1551/3 adapter cable
-
VAG 1598/18 test box
-
Multimeter (Fluke 83 or equivalent)
-
VW 1594 connector test kit
-
Wiring diagram
Checking conditions
-
Coolant temperature at least 80 °C (176 °F)
-
Exhaust system free of leaks between cylinder head and Three Way Catalytic Converter (TWC)
Functional check
-
Connect VAG 1551 scan tool (VAG 1552) and select "Rapid data transfer" operating mode.
-
Press buttons -0- and -1- to insert "Engine Electronics" address word 01. Carry out selection at idle. Refer to "On-Board Diagnostic". See:
Powertrain Management/Computers and Control Systems/Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
-
Press -Q- button to confirm input.
Indicated on display
Read measuring value block
HELP
Input display group number XXX
NOTE: If something different is indicated on the display:
See Scan tool operating instructions.
-
Press -0-, -0- and -1- to input display group number 001.
-
Press -Q- button to confirm input.
Indicated on display (1, 2, 3 and 4 = Display fields)
Read measured value block 1
->
1
2
3
4
-
Read oxygen sensor factor in display field 3.
Specification: display fluctuates around 1
If oxygen sensor factor does not fluctuate:
-
Carry out road test to clean HO2S probe, then repeat check.
If the oxygen sensor factor specification is not attained:
-
Check oxygen sensor heating. See: Oxygen Sensor Heating, Checking
If the displayed value remains constant:
-
Press -> button.
-
Press buttons -0- and -6- to select "End Output" function 06.
-
Press -Q- button to confirm input.
-
Switch ignition off.
-
Continue check according to following table.
